Recording apparatus and recording method

Abstract

Quantization is performed on multi-valued data corresponding to a non-overlap recording area and one of recording heads on the basis of a dither pattern and multi-valued data corresponding to the non-overlap recording area and the other one of the recording heads, and also arrangements of thresholds for the dither patterns used between the scanning operations are varied.

Description

BACKGROUND OF THE INVENTIONField of the Invention[0001]The present invention relates to a recording apparatus and a recording method.Description of the Related Art[0002]A recording apparatus has been proposed which records an image by ejecting ink while a recording unit having an ejection nozzle array in which a plurality of ejection nozzles for ejecting the ink are arranged is scanned multiple times with respect to a unit area of a recording medium.[0003]In the above-described recording apparatus, shortening of a recording time with respect to the recording medium has been demanded up to now. To achieve the above-described shortening of the recording time, Japanese Patent Laid-Open No. 10-044519 describes a use of a recording unit including one piece each of a recording unit provided with a plurality of ejection nozzle arrays for ejecting ink of a plurality of colors respectively on a left side and a right side of a scanning direction as the recording unit, According to Japanese Pa...

AI Technical Summary

Benefits of technology

The present invention aims to improve image quality by reducing the decrease in granular impression, improving uniformity between overlap and non-overlap recording areas, and preventing a decrease in image density during multiple scanning operations.

Problems solved by technology

In a case where the recording is performed by only one of the recording unit on the left side and the recording unit on the right side with respect to the entire area in the scanning direction on the recording medium, there is a fear that an image quality of an image obtained at a boundary between the area recorded by the recording unit on the left side and the area recorded by the recording unit on the right side may be decreased due to this density difference.

Herein, in a case where the recording is performed by using the above-described recording unit, when an arrangement of dots formed in an area where the left and right recording units perform the overlap recording (hereinafter, which will be referred to as an overlap recording area) and an arrangement of dots formed in an area where only one of the left and right recording units performs the recording (hereinafter, which will be referred to as a non-overlap recording area) are different from each other, there is a fear that the image quality may be decreased.

When the dot arrangement differs between the adjacent overlap recording area and non-overlap recording area, granular impression and uniformity differ between those areas, which causes the decrease in the image quality.

However, in a case where a skew conveyance of the recording medium between the scanning operations or a deviation in ink ejecting positions is caused between the scanning operations due to a fluctuation in a speed of the recording head, an inclination, or the like, there is a fear that the image density is largely decreased when the dots are formed at the exclusive and also complementary positions.

In particular, since the deviation in ink ejecting positions between the left and right recording units which is derived from a manufacturing error, an attachment error of the recording units, or the like may in addition to the above-described skew or fluctuation in the overlap recording area also be caused, the decrease in the image density becomes more conspicuous.

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